Imagine a product that, when used properly, is safe, valuable and environmentally sound, but when used improperly is dangerous to the environment. Many such products exist. Drano is safe and useful—except when stored in the pantry salt shaker. Firearms save many lives—but not when used by criminals. Automobiles get us where we need to go—but in the hands of bank robbers and drunks they can be lethal weapons. And the gasoline from our automobiles can either get us rolling, burn our house down, or leak through rusty gas tanks into the ground....